Interview Questions
Practice the exact questions companies are asking right now.
Questions
10.0k
Companies
520
Updated
08.21.2026
10.0k Questions 520 Companies08.21.2026
PLTCHK
"I got asked a hardcore MCM DP question and I saw it on PracHub as well. Solved that question in 5 minutes. Without PracHub I doubt I could solve it in 5 hours. Though somehow didn't get hired, perhaps I guess I solved it too fast? /s"
_The_TaNk_
"Believe me i'm a student here jn US. Recently interviewed for MSFT. They asked me exact question from PracHub. I saw it the night before and ignored it cause why waste time on random sites. I legit wanna go back and redo this whole thing if I had chance. Not saying will work for everyone but there is certainly some merit to that website. And i'm gonna use it in future prep from now on like lc tagged"
ChrisSenior SWE, LinkedIn
"10 years of experience but never worked at a top company. PracHub's senior-level questions helped me break into FAANG at 35. Age is just a number."
sleepy33
"I was skeptical about the 'real questions' claim, so I put it to the test. I searched for the exact question I got grilled on at my last Meta onsite... and it was right there. Word for word."
JakeSenior ML Engineer, Lyft
"Got a Google recruiter call on Monday, interview on Friday. Crammed PracHub for 4 days. Passed every round. This platform is a miracle worker."
nuggetlord
"I've used LC, Glassdoor, and random Discords. Nothing comes close to the accuracy here. The questions are actually current — that's what got me. Felt like I had a cheat sheet during the interview."
CarlosFull Stack, Shopify
"The solution quality is insane. It covers approach, edge cases, time complexity, follow-ups. Nothing else comes close."
boba.tea.vibes
"Legit the only resource you need. TC went from 180k -> 350k. Just memorize the top 50 for your target company and you're golden."
AndySWE-II, Google
"PracHub Premium for one month cost me the price of two coffees a week. It landed me a $280K+ starting offer."
couchpotato99
"Literally just signed a $600k offer. I only had 2 weeks to prep, so I focused entirely on the company-tagged lists here. If you're targeting L5+, don't overthink it."
ShrutiData Engineer, Salesforce
"Coaches and bootcamp prep courses cost around $200-300 but PracHub Premium is actually less than a Netflix subscription. And it landed me a $178K offer."
midnightramen
"I honestly don't know how you guys gather so many real interview questions. It's almost scary. I walked into my Amazon loop and recognized 3 out of 4 problems from your database."
BiancaFrontend Eng, Figma
"Discovered PracHub 10 days before my interview. By day 5, I stopped being nervous. By interview day, I was actually excited to show what I knew."
tambrahm007
"I recently cleared Uber interviews (strong hire in the design round) and all the questions were present in prachub."
toa
"The search is what sold me. I typed in a really niche DP problem I got asked last year and it actually came up, full breakdown and everything. These guys are clearly updating it constantly."
Showing 20 results
Role
Hard
Data ScientistDiagnose uplift drop in email A/B tests
Personalized Product Emails Experiment — Design, Sizing, and Debugging Conflicting Reruns Context An e-commerce company plans to A/B test personalized...
Analytics & Experimentation
4
0
66 people solved
Oct 13, 2025
Hard
Data ScientistDetect leakage and evaluate a prediction model
Churn Prediction Model: Leakage, Validation, KPIs, Interpretation, Monitoring Context: You inherit a weekly-scored model that predicts whether a user ...
Machine Learning
7
0
72 people solved
Oct 13, 2025
Hard
Data ScientistDesign and analyze an A/B test
Experiment Design: Proximity-Weighted Search Ranking A/B Test You are designing a 14-day, 50/50 user-level randomized A/B test for a marketplace's sea...
Analytics & Experimentation
7
0
58 people solved
Oct 13, 2025
Medium
Data ScientistDesign and power an A/B on question mix
Experiment Design: Replacing 10% "Other" Verbal With Grammar in a 15-Min, 19-Question Section You need to test whether replacing the 10% "other" verba...
Analytics & Experimentation
1
0
26 people solved
Oct 13, 2025
Medium
Data Scientist LockedCompute counts and pacing for verbal section
This question evaluates discrete allocation and time-constrained optimization skills, focusing on integer allocation, expected-value decision making, ...
Statistics & Math
4
0
37 people solved
Oct 13, 2025
Medium
Data ScientistDesign MapReduce and Spark jobs
Big data systems: (a) Explain Hadoop’s fault tolerance (HDFS replication, task re-execution) and why MapReduce includes shuffling and sorting; in a wo...
Data Manipulation (SQL/Python)
2
0
50 people solved
Oct 13, 2025
Hard
Data ScientistExtract companies from noisy text
Extracting Company Names from Noisy Resumes and Web Snippets Context You receive messy resume text (PDF-to-text/OCR, varying casing) and scraped web s...
Machine Learning
4
0
71 people solved
Oct 13, 2025
Medium
Data ScientistEvaluate and select K in K-means
K-means Clustering: Concepts, Initialization, Model Selection, Preprocessing, and Business Validation Context: You are clustering customer data with n...
Machine Learning
2
0
46 people solved
Oct 13, 2025
Medium
Data ScientistCompare trees, RF, and gradient boosting
Decision Trees, Random Forests, and Gradient-Boosted Trees You are interviewing for a Data Scientist role and are asked to compare common tree-based m...
Machine Learning
6
0
41 people solved
Oct 13, 2025
Hard
Data ScientistDesign an A/B test with guardrails
A/B Test Plan for a New Checkout Flow (Onsite Data Scientist) Context: You will run an online experiment of a new checkout flow. The baseline conversi...
Analytics & Experimentation
4
0
45 people solved
Oct 13, 2025
Medium
Data ScientistSimulate via inverse transform and Gibbs
Inverse transform: (a) Derive an algorithm to simulate from the Logistic(μ, s) distribution using its CDF and inverse CDF; show how to obtain samples ...
Statistics & Math
4
0
50 people solved
Oct 13, 2025
Medium
Data ScientistDetect sequence rule and repair anomaly
Implement next_value(seq: list[int]) that detects the rule of a numeric sequence and returns a tuple (model_name, parameters, anomaly_index_or_None, n...
Coding & Algorithms
4
0
64 people solved
Oct 13, 2025
Medium
Data Scientist LockedOptimize no-penalty test strategy
This question evaluates proficiency in probability, expected-value calculations, stochastic decision-making, and constrained optimization applied to t...
Statistics & Math
8
0
57 people solved
Oct 13, 2025
Medium
Data ScientistLead innovation and automate a critical process
Describe a specific project where you led an end-to-end innovation from idea to production. Be concrete: - What was the problem, constraints, and succ...
Behavioral & Leadership
6
0
91 people solved
Oct 13, 2025
Hard
Data ScientistDesign leakage-free predictive maintenance pipeline
Predict 24-hour Machine Faults from an Hourly Panel (End-to-End Design) Context You are given a machine–hour panel: one row per machine per hour with ...
Machine Learning
9
0
72 people solved
Oct 13, 2025
Medium
Data ScientistClean and aggregate factory event data in Pandas
You are given three Pandas DataFrames for a factory: (1) events[event_id, machine_id, ts_utc (datetime64[ns, UTC]), event_type in {'start','stop','fau...
Data Manipulation (SQL/Python)
1
0
10 people solved
Oct 13, 2025
Hard
Data ScientistSenior+Design and analyze pricing-page A/B test
AB Test Plan: New Pricing-Page Layout Context: You will run a 2-arm online experiment on a pricing page. The primary metric is user-level paid convers...
Analytics & Experimentation
2
0
52 people solved
Oct 13, 2025
Medium
Data ScientistWrite and explain gradient descent pseudocode
Task: Batch Gradient Descent for Linear Regression (with Intercept) You are interviewing for a Data Scientist role and are asked to implement batch gr...
Machine Learning
7
0
56 people solved
Oct 13, 2025
Hard
Data ScientistPersuade engineers to launch pinned-unread chats
Pitch: Pinning Conversations for High-Unread Users Context You are proposing a feature that pins a small set of conversations to the top of the inbox ...
Behavioral & Leadership
4
0
51 people solved
Oct 13, 2025
Medium
Data ScientistCompute unread and multi-account user percentages
You’re given two tables. Write ANSI-SQL to answer parts (a)–(d). Treat a notification as unread if read_at IS NULL. Denominator for user-level percent...
Data Manipulation (SQL/Python)
13
0
84 people solved
Oct 13, 2025